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Quarterly Financial Information (Parenthetical) (Detail) - ASU 2016-09 $ / shares in Units, $ in Millions	3 Months Ended
	Jul. 31, 2016 USD ($) $ / shares
Quarterly Financial Information [Line Items]
Net income increased | $	$ 2.6
Net income per basic share increased	$ 0.05
Net income per diluted share increased	$ 0.05

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